Internal-combustion engine



April 5, 1927. 1,623,390

E. R. BURTNETT INTERNAL COMBUSTION ENGINE Fiied June 18, 1925 2 SheetSheet l E, R. BURTNETT INTERNAL COMBUSTION ENGINE Filed June 18. 1925 2Sheets-Sheet 2 Patented A r. 5, i927.

[UNITED emi "P ENT OFFICE.

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Application filed June 18, 1 925. semi-1w y .parts that will hereinafter1;

(My invention relates generally to internal n scr1bed\ and-claimedandilli1s't-"te'd ""th combustion engines and more particularly to amulti-cylinder V-block engine that operates on the two strokecycleprinciple and my 1nvention has for its principal object the pro= vvision of arelatively simple and practical arirangement of transfervducts for conveying charge volumes of gaseous fuel or the like "fromthe pumping chambers in one wing of I the V-block to certain of thecombustion chambers in the opposite wing'of said block.

- My improved transfer duct arrangement is v particularly designed foran engine having eight cylinders and which latter are arranged in tworows of four cylinders each with two dot the cylinders of each'rowhaving straight diameter bores and the other two cylinders of said rowhaving two diameters in order to rovide a combustion chamber and apumpmg chamber in each vof said two-diameter bore cylinders. I

Y My invention resides in the combination of transfer ducts between thepumping chamhers or one'row of cylinders with certain" of 2 thecombustion chambers of the other row of cylinders, said two rows orcylinders being dis o'sed parallel with the axis" of the crank s aft,and said two rows of cylinders being arranged 90 apart with ajtwo crankI pin crank shaft and the pistons of the two end cylinders at eitherendof the two rows being connected to one of the two crank pins .of saidcrank shaft thereby'providing an an- 1 rangement whereby four pistonsare conneeted to each crank pin and with two of the set of four pistonsbeing angularly disposed with respect to'the other two of said set offour pistons so-that a proper time relation will exist for properfunctioning of the transfer of the pumped fresh charge volume from thepumping chamber of one cylinder to a combustion chamber in the oppositerow at a time when the respective-actlon and position of the pistonswithin the'combined pumping and combustion cylinders are such 1 as topermit ejection and induction of the other.

With the foregoing and other objects in view, my invention consists incertain novel features of construction and arrangement of nate the wingsofva substantially cyhndricalhlock,'saidwingabein :.disposed chargevolume from one chamber to the accompanyingdraw'gsin.whiclg F1g. 1 rs\atop view-of an internal in combustion engine having the improyedarrangement of transfer ducts as: contemplated by my 111V enti0fi". E KFig. 2 is a vertical flongitudinzil sect taken on tl1e.line2 2otFig,.-1.Y

ion

Fig. 3 is a dia ramkmati taken approxlmate y on th l Fig.1. ;.;\J

Fig. 4 is-a. diagrammatic cross sectioii I i akenl approx mately on theline or. as

Fig. 5 a. dia rammatic crow section th n approximate y a am ne "a e of Lfig. 6 gis. a ..diagrammati cross',, s cti01i 7o gaikenl approximate yozn the bf I v fieferring b numralsdo the accompany mg draw w 'chillustrates a practical em bodiment o my invehtion lfl 'andll-desig 15shaped.

inplanes., 9t): apart and said win rising from a suitableyci'an-k case12and"d1 e latter being provided. with three main bearingslfl g for acrank shaft'l4. ,Thiscran shaft has two crank pins 15 and 16 and eachpin has two machined bearing surfaces that are adapted to'be engaged bythe lower endsof 1 cohfii'ecting rods as will hereinafter be more yQ f rh Thecrankping f k 14 1 'gd directly opposit in g h otht or 180,apart. ai 1 v Formed ill-block 10 adj time atlas are straight diameter borembustioncham o\ bers 18 and 19 and formed, said blockbe-r tweenisaidcombustion chain rs are two two diameter bores, the upperpo'rtio'n sofsmaller diameter .iunctioning as combustion .cham-' heist-'20 and 21 andthelower portions. of larger-diameter functioning as charge volumepumping'fchambers 22=and23. I F I The axes of the four chambers in wing10 4 are parallel and in the same longitudinal plane,'-and said fouraxes. intersect the axis 109- of crank shaft 14.- Secured on't'op ofblock 10 is a head b1ock 24= having inits .under- 20 posed transverselyopposite to the two-diamside shallow recesse s 25 and 26.. Reoess25 1 Iblock 11 is identical with that of block 10,,

connects and constitutesa common clearance space for the head or innerends of combustion chambers 18 and 20 andin like manner recess 26connects and constitutes a common clearance-chamber for the head orinner ends of combustion chambers '19 and 21. I Thestructure andequipment of wing or said block 11 having \combus tion chambers 27 and28 adjacent to its ends and in'trans- .v'erse alignment respectivel withcombustion chambers 18 and 19, 1 ormed in block 11 between thecombustion chambers27 and- 28 are two two-diameter bores the upper orsmaller -portions 29 and 30 of which function as combustion chambers andthe lower portions of larger diameter 31 and 32 function as chargevolume pumping chambers. The" two-diameter chamber 29, 31, is diseterchamber 20, 22, while the two-diameter chamber 30, 32 is intransversealignment with the two-diameter chamber 21, 23, The axes ofthe tour bores or chambers in wing. 11 are parallel and in the samelongitudinal plane and their axes intersect the axis of crank shaft 14.

-chambers 27 and 29 and and 30.

A head block 33 is arranged on the upper end of wing 11 and formed initsunderside are shallow recesses 34 and .35 which connect respectively thehead. ends of combust on Straight diameter pistons such as 36 arearranged for reciprocatory movement within the combustion chambers'18and 27 and two- 7 diameter pistons such as 37 are arranged for 0 v j,-',,'et.er pistons 3 7.l ar.econnected by suitable con-z v nectingrodssuchas 38th crank-rials.

' arranged operation within the two-diameter chambers 20,22 and 29, 31.The pair of straight diameter pistons-36; and the pair of two-'d1am-Straight diameter pistons such as] 39 are r operation within thecombustion chambers 19 and 28 and two-diameter pistons 40 are'arra'ngedfor operation within the two-diameter chambers 21, 23 and 30, 32. Thetwo straight diameter pistons. 39 and the two two-diameterpistttlms 40are cmnect}; necting ro s suc ed tocran'k pin 16 by co A chargevolumeitransfer duct 42 leads from outlet portsatthe upper end ofpumping chambers22 to inlet orts in the lower portion of combustioncamber 29" and a similar transfer duc t31eadsjfromoutlet ports at theupperen. of pumping chamber 23 to inlet ports thatleadinto'the lowerpor1-' tion of combustion chamberf30. A charge volume transfer duct4leads from outlet ports at the upper .en'dof pumping chamber '32 toinlet ports that lead into thelower portion of combustion chamber 20. Afourthv charge volume transfer duct 45 leads from the outlet ports atthe upper portion of to the other crank crank shaft.

pumping chamber31 to inlet orts that lead into the lower portion of comustion chamber 21. Obviously the charge'volume pumplng chambers 22, 23and 31 and 32 must necessarily be provided with charge volume inletports, the same being located so as to admit gaseous fuel or the likeinto said pumpingchambers when the pistons therein are at the lower endsof their travel and the combustion chambers 18 and 19 and27 and 28 mustbe provided with exhaust ports such as 46 that are uncovered and openwhile the pistons that operate within said combustion chambers are atthe lower ends of their travel.

- As a result of In improved arrangement of transfer ducts V-blockstructure two stroke 0 cle lnternal combustion engine the charge volumesare pumped from the pumping chambers in one wing of the block to thesmaller diameter diameter chambers in the opposite block, and thistransfer of the charge volumes is permitted to take place or be effectedas a re-' sult of the V-arrangement-of the two rows or cylinders. Thedischarge of the two pairs of two-diameter cylinders and the arrange,-

'ment whereby the four pistons at oneend of the engine are connected'toone pin of the twothrow crankshaft and the pistons with- Obviously minorchanges in the size, form .etween the wings of a or combustion chamberportionsof the two- 'in theother four cylinders being connected 7 pin ofsaid two throw and construction of the various parts of my improvedinternal combustion vengine may vbe made and substituted for thoseherein shown and described without departing from the spirit of myinvention, the scope of which is set forth in thelappended claims.

I claim as my invention J 1. In a two stroke cycle ntern p I tionengine, two rows of cylinders arranged to form a V-structure with fourcylinders in each wing of said V-structure andthe wings being arrangedapart, the bores of the two center cylinders of each rowhaving twodiameters so that each of said two centercylinders has a combustionchamber land a pumping chamber, the two end cylinders of each row havingstraight diameteiiboresand a charge volume transfer duct leading fromthe upper portion of the 'um'ping chamber of each two-diametercylmderpto the combustion chamber in one of'the two-diameter cylindersin the opposite row; t 3 I 2. In .a two stroke cycle internal combustione gine, two rows of cylinders arranged to form a V-structu're with "fourcylinders-in each wing of said'V-structurerand the wings being arranged.90 apart, the bores of it e two center cylinders of eachrow having'jtwodiameters so that each of' said two}; nter cylinders has a combustionchamber-(and a pumping chamber, the two end cylinders of each row havingstraight diameter bores, a charge volume transfer duct leadin from theupper portion of the pumping c amber of each two-diameter cylinder tothe combustion chamber in one of the two-diameter cylinders in the theopposite row, a crank shaft having two crank pins arranged 1 8 apart,pistons arranged for'operation wlthin'all of the cylinders,COIlIlBCtlOIlS'fI'OIIl four of the pistons at one end of the V-structureto one of said crank pins and connections from the pistons'within theother four cylinders to the other crank pin.

3. In a two stroke cycle internal combustion engine, eight cylindersarranged in two rows of four cylinders each, the two rows being disposed90 apart, the two end cylinders of each row having straight diameterchambers, the two .center cylinders of each row having two-diameterchambers, the smaller diameter portion of each two-diameter chamberconstltuting a combustion chamber the head end of which is connected bya common clearance space with the head end ofthe adjacent straightdiameter chamber,

the larger diameter portion of each twodiameter chamber constituting apumping chamber and a transfer duct connecting each pumping chamber witha smaller diameter chamber of one of the two-diameter chambers in theopposite row of cylinders.

4. In a two stroke cycle internal combustion en ine, eight cylindersarranged in two \rowso four cylinders each, the two rows ,being disposed90 apart, the two end cylinders of each row having straight diameterchambers, the two center cylinders of each row having two-diameterchambers, the

smaller'diameter portion of each two-diame ter chamber constituting acombustion chamber the head end of whichis connected bya commonclearance space with'the head end of the adjacent-straight diameterchamber, the larger diameter portion-of each twodiameter chamberconstituting a pumping chamber, a transfer duct connecting each pumpingchamber with a smaller diameter chamber of one of the two-diameterchambers in the opposite row of cylinders, a crank shaft having twocrank pins arranged 180 apart, pistons arranged for operation within thechambers of the eight cylinders, the pistons within four of thecylinders at one end of the-V-struc'ture being connected to one of thecrank pins of said crank shaft andthe pistons within the four cylindersat the other endof the V-structure bein connected tpl tile other one ofthe two pins 0 said crank s a t.

5. In a two stroke cycle internal combustion engine, two rows ofcylinders arranged to form a V-structure with four cylinders in eachwing of said V-structure, said wings being arranged 90 apart, the boresof the two cylinders ofeach row each having two diameters so thateach ofsaid two center cylinders has a combustion ,chamber anda pumpingchamber, substahtially straight transfer ducts leading from the pumpingchambers in the left hand row of cylinders from the front end of theengine to the combustion chambers in the two center cylinders of theright hand "row and crossed transfer ducts leading from the pumpingchambers in I! all the two center cylinders in the right hand I row tothe combustion chambers of the'two center cylinders in said left hand'row.

6. In a two stroke cycle internal combustion engine, two rows ofcylinders arranged to form a V-structure with four cylindersin each wingof said V-structure, said wings combustion chambers of the two centercylinders in said left hand row and the two end cylinders of both rowshaving straight diam: eter bore chambers. s In testimony whereof I alfixmy signature.

' EVERETT R. BURTNETT.

